Yikes! What a flight over enemy territory! In real life, they'd never have done that for a mere transfer flight!
The superiority of the Nupe 11 over the Eindecker is perfectly historical. The Eindecker really wasn't much of a fighter at all. The only advantage it had was its synchronized MG, which no Entente airplane had in those days. But the Eindecker was meant to attack clumsy Entente two-seaters, not fight against the deadly Nupes.
In fact, the French air force quickly achieved air superiority over the Verdun battlefields. The Germans weren't wiped out or anything, but their air ops were seriously restricted by the large numbers of better French airplanes, especially Nupes, operating in the Verdun sector. The same happened at the Somme. It wasn't until the formation of Jastas and the arrival of Halbys and Albs in the fall of 1916 that the situation in the air became favourable for Germany again. This period lasted until the summer of 1917.
But that's still so far in the future that it's better not to talk about it!
"Upon my word I've had as much excitement on a car as in the air, especially since the R.F.C. have had women drivers."
James McCudden, Five Years in the Royal Flying Corps